![]() ![]() Afterwards, a case study was carried out on a highway in this city and the equivalent level of noise in the surroundings was calculated. Therefore, in this study it was first tried to obtain a model for calculation of noise pollution in the city of Tehran with regard to the unique traffic conditions of this city. However, the model used in this research complies with the conditions governing Tehran City and thus its parameters also conform with the study area. The reason is that the number of motorcycles crossing cities of low-income developing countries is high. In general, results of different studies suggest that the level of noise in the developing country is higher than in the developed countries. For example, in Vietnam, motorcycle is a major cause of diffusion of noise in cities. Hence, the applied model used for calculation of noise varies by country. These models are developed by considering factors influencing noise pollution in the countries. Numerous models are employed in different countries. This objective was pursued by modeling noise pollution diffusion on the basis of traffic parameters. The primary objective of this research was to calculate the noise pollution in the vicinity of a highway located in Tehran. In the following, the research problem is stated and the associated problems and issues are also discussed. ![]() In this research, it was tried to propose a noise modeling for the study area so as to examine and analyze the conditions of the region. This model was used for noise pollution modeling in different cities in the world, including Tehran. The reason is that they are easy-to-use in traffic studies and provide satisfactory precision in the prediction of noise pollution of the region. However, among all these models, models designed on the basis of average velocity and traffic volume are more common. In some studies, the genetic algorithm and the artificial neural network model were used to design a model of noise diffusion model. Some studies examined the relationship between noise and the flow-velocity curve and presented models based on the results. The common method of calculating noise pollution in the case of roads is the use of traffic parameters such as velocity and volume. Different methods are employed in order to assess and select a suitable method for controlling noise pollution in a region. However, the maintenance costs associated with this method are higher in the long run. The primary cost of application of this asphalt is lower than that of construction of sound barriers. It was later developed and the technical specifications, grading and quality of materials used in this asphalt were also spread. This project was for the first time launched in Spain and United States. Due to the high ratio of pores in this type of asphalt, the sound wave, which is produced by vehicles mainly as a result of rolling of tiers, is entrapped in the superstructure and its energy is consumed and consequently less noise is produced. Another method which is well known around the globe and is used in many countries is using porous asphalt. In this method, production and installation of these barriers will cost time and money more than usual project. Special design of these barriers, give them ability to entrap sound waves in roadway and avoid them to emit in area. One way, which is common in Tehran, is installing sound barriers in road sides. For noise emission reduction, several methods are conducted by authorities and they were successful. Roads are one of the most effective noise emission resources in cities. There are many noise resources exist in environment and to reduce their effects in the area, there are several methods. Neurological and psychiatric diseases, hearing problems and sleep disorders are effects of noise pollution in the area. But the consequences of its presence in the community can be very serious. At first glance, it may not seem very important. These days, due to population growth in major cities, many issues and problems bother related governors. ![]()
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